Why when I unwrap my model does the field for the Torso come out so strange?
I am pretty sure you are unwrapping the mesh wrong. You have it unwrapped in a sort of round ball shape on the UV map. If you unwrap it with cylinder projection, cube projection, or even just select one side of the chest and unwrap it that way, it will be more square-like/flat. That would work a bit better and you would not have stretched textures.